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United States Patent | 5,204,899 |
Israelsen ,   et al. | April 20, 1993 |
A vector quantization me employs mirrored input vectors to increase the reproduction quality of transmitted vector quantized data. A codevector is selected from a vector quantization codebook for each possible orientation of an input vector. The codevector having the smallest distortion relative to the input vector is selected for transmission. An identification code identifying the selected orientation is also transmitted.
Inventors: | Israelsen; Paul D. (North Logan, UT); Lucas; Keith (Richmond Hill, CA) |
Assignee: | Scientific-Atlanta, Inc. (Atlanta, GA) |
Appl. No.: | 794563 |
Filed: | November 19, 1991 |
Current U.S. Class: | 348/405.1; 341/200; 375/240.03; 375/240.18; 380/217 |
Intern'l Class: | H04N 007/167 |
Field of Search: | 380/10,14 381/30,35 358/133,135,136 341/200 |
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Nasrabadi, N. et al.; "Image Coding Using Vector Quantization: A review"; IEEE Comm; vol. 36 No. 8; Aug. 1988. Gray, R. M.; "Vector Quantization"; IEEE ASSP Mag. vol. 1 pp. 4-29; Apr., 1984. "Vector Quantization of Digital Images", Baker, Richard L., Stanford University-University Microfilms International, UMI Dissertation Information Service, (Copyright, 1984). |